Improved blowing-fan



UNITED STATES PATENT OFFICE.

SYLVAN'IA; ELIZABETH BAUMEISTER ADMINISTRATRIX OF SAID HENRY BAUMEISTER, DEUEASED.

IM PROVED BLOWI NG-FAN.

Specication forming part of Letters Patent No. 11,047, dated June 6, 1854.

`To all whom it may concern:

Be it known that we, THOMAS WALLACE, of

the city and county of Philadelphia, State of Pennsylvania, and HENRY BACMEISTER, of the same city, county, and State, have invented a neuT and useful Improvement in Blowing-Fans; and We do hereby declare that the following is a full, clear, and exact description of the construction and operation 0f the same, reference being had to the annexed drawings, making a part of this speciication, in which--` Figure I is a longitudinal elevation, and Fig. II a cross-section of the improved fan.

The outside casing A of our fan does not differ from those used in other fans of wellknown construction. Inclosed in the outside case A is a pulley or drum B, fitting with its circumference into the circular openings formed in the side plates a d of the casing A Without coming in frictional contact with the same. The pulley B is secured to the driving-shaft U, and receives rotary motion from a belt passing over the driving-pulleyD in the usual manner. From the above description it will appear that the circumference of the pulley B forms a diaphragm between the central space contained Within its own circumference and the annular space inclosed by the side plates and periphery of the easing A. To establish acommunication between these two spaces, We furnish the circumference of the pulley B with one or more openings E of a rectangular or other section, and we also surround the said opening E with a ledge or projection, as shown in the drawings. On the side of the opening E, toward which the rotary motion takes place, as indicated by the arrow, the said ledge assumes the shape of a radial Vane F, extending to lthe sides and periphery of the casing A without coming in actual contact therewith. On the opposite side the ledge G is curved and considerably lower, so as to leave a clear space between its extreme radial distance and the periphery of the casing. The ledges F and G are connected by thin ribs placed at right angles to the axis of rotation and close to the sides of the casing A. A rapid rotary motion in the direction of the arrows being imparted to the pulleyB, the air is made t-o ow through the opening E into the annular space formed` by the side plates and periphery of the casing A with a pressure due to its centrifugal force. The movement of the air through the lopening E is still further aided by the position of said opening directly` in the rear of themdisplacingvane F, a partial vacuum being formed in the rear of said vane due to its rapid movement.

We do not claim any improvement in the outside casing of a fan, nor in the means and apparatus by which rotary motion is produced; but

What We do claim as our improvement, and desire to secure by Letters Patent, is"

The cylindrical revolving diaphragm AB,with one or more openings for the escape of the air by the combined action of centrifugal force and a vacuum, substantially in the manner herein set forth.

THOS. WALLACE. HENRY BAUMEISTER.

Witnesses:

SEPTIMUs NoEEIs, JAMES BING. 

